Measurements of the \(Z\)  boson production cross-section are important tests of the SM. LHCb's unique coverage of the forward region allows for
complementary results to those obtained from the general purpose detectors (GPDs) at the LHC. LHCb has previously published results using \(e^+e^-\)  [1]} and
\(\mu ^+\mu ^-\)  [2]} final-states. Here, measurements of the \(\tau ^+\tau ^-\)  final-state [3]} are described. These provide a verification of previous results and a test of the universal coupling of the \(Z\)  to different flavours of lepton.
